Complete the following passage by choosing the correct terms from the word bank.

The Stefan–Boltzmann law states that the power radiated per unit area is P/ $A = \varepsilon$ ______ $T^{4}$ , where $\sigma$ $\approx 5.67$ $\times 10$ ⁻⁸ W/( $m^{2} \cdot K^{4}$ ) is the ______ constant and $\varepsilon$ is the ______ of the surface.

Word bank: σ · Stefan–Boltzmann · emissivity · Boltzmann · reflectivity · π

Hints

The radiated power depends on the fourth power of the temperature.
A perfect emitter has an emissivity of one.

Show the answer

The Stefan–Boltzmann law states that the power radiated per unit area is P/ $A = \varepsilon$ σ $T^{4}$ , where $\sigma$ $\approx 5.67$ $\times 10$ ⁻⁸ W/( $m^{2} \cdot K^{4}$ ) is the Stefan–Boltzmann constant and $\varepsilon$ is the emissivity of the surface.

Why

Stefan–Boltzmann law: $P = \varepsilon\sigma AT^{4}. A$ perfect black body has $\varepsilon$ = 1.

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Complete the following passage by choosing the correct terms from the word bank.

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